KR20210064179A - Film-forming Polymer Having Excellent Water- and Oil-repellent Properties, and Long Wear Cosmetic Composition Comprising the Same - Google Patents

Abstract

The present invention relates to a polymer film-forming agent having excellent water-repellent and oil-repellent properties at the same time, and a cosmetic composition having excellent cosmetic durability including the same. The polymer film-forming agent of the present invention and the cosmetic composition comprising the same increase the durability of makeup, so even after a long period of time has elapsed, the number of correction makeup is reduced or it is not necessary to apply correction makeup.

Description

Polymer film-forming agent having excellent water-repellent and oil-repellent properties at the same time, and a cosmetic composition containing the same, and having excellent cosmetic durability (Film-forming Polymer Having Excellent Water- and Oil-repellent Properties, and Long Wear Cosmetic Composition Comprising the Same)

The present invention relates to a polymer film agent having excellent water-repellent and oil-repellent properties at the same time, and a cosmetic composition having excellent cosmetic durability including the same. More specifically, the present invention relates to a cosmetic composition with excellent cosmetic durability and a method for manufacturing the same, which uses a polymer film agent having excellent water and oil repellency properties at the same time to improve the phenomenon of makeup crumbling and smearing due to sweat, sebum, external moisture, etc. will be.

In general, color cosmetics consist of three main components: powder, oil, and water. The color cosmetics include base makeup such as face powder, compact, powder foundation, two-way cake, make-up base, liquid foundation, and cream foundation, and eye shadow, powder blush, and lipstick depending on the composition, formulation, or purpose of use. , eyeliner and point makeup such as mascara.

These products are applied to the skin and adhered for about 8 to 12 hours, and while they are attached, the makeup crumbles due to sweat, sebum, and external moisture secreted from the skin, so that they are smeared on mobile phones, cups, and clothing. The phenomenon of makeup being erased at the time of the day has been observed, so consumers are implementing corrective makeup in which makeup is applied or removed and then makeup is reapplied. Accordingly, there is a trend in favor of cosmetics or makeup methods with high makeup durability with little or no correction makeup.

In order to solve the makeup persistence, Japanese Patent Publication No. 7-119168 discloses a method of using powder coated with silicone or fluorine-based surface treatment agent so that the powder does not get wet with sweat or sebum, thereby reducing the greasiness caused by excessive sweat and sebum. However, the powder coated with a silicone-based surface treatment agent does not maintain makeup durability as it is wetted by sebum, and the powder coated with a fluorine-based surface treatment agent has weak adhesion between powder-powder or powder-skin, and is oxidized to secreted sebum. There is a problem in that the feeling of use and formability are deteriorated because the veil itself is excited and agglomeration occurs.

In addition, methods such as mixing powder with excellent oil absorption to absorb excess sebum have been proposed. However, since these powders absorb water or oil added during cosmetic preparation, they have already lost much of their oil absorption function during actual makeup. In particular, when there is a large amount of powdered products, it is difficult to increase the amount of blending because molding is difficult because the oil used as a binder is absorbed excessively.

Another method is to use a metal oxide to increase the durability of makeup by reacting the metal ion of the metal oxide with the fatty acid, which is a component of sebum, which is the main cause of shine, and solidifies it into a metal salt.

However, the above methods did not suggest a fundamental solution that can increase the makeup durability by reducing the change in the makeup film.

Numerous references are referenced throughout this specification and citations thereof are indicated. The disclosures of the cited documents are incorporated herein by reference in their entirety to more clearly describe the content of the present invention and the level of the art to which the present invention pertains.

Japanese Special Publication No. 7-119168

Accordingly, an object of the present invention is to provide a polymer coating agent, which is characterized in that it has water-repellent and oil-repellent properties at the same time as a means for solving the above problems.

Another object of the present invention is to provide a cosmetic composition and cosmetics having excellent makeup durability without being stained or erased by sweat, sebum, external moisture, or the like.

Further objects and advantages of the present invention will become more apparent from the following detailed description of the invention, claims and drawings.

One aspect of the present invention is to provide a polymer coating agent for improving the durability of a cosmetic preparation, characterized in that it contains both a hydrophilic structure and an aromatic structure.

In the case of a water-dispersion coating agent, oil repellency is maintained, but the expression of water repellency is limited, which limits its use in various fields. Although there are hydrocarbon-based, silicone-based, and silicone-acrylic copolymers in the oil-dispersion coating agent, the oil repellency to oil is not sufficient, so that the makeup persistence is low. In addition, although various silicone-based film formers are combined to improve the quality, the manufacturing process is complicated and it is insufficient to simultaneously realize water/oil repellency properties.

It is an object of the present invention to prepare a polymer film material with improved cosmetic durability by introducing a hydrophilic structure and an directional structure to have water/oil repellency properties at the same time.

In the case of the polymer coating agent having excellent water/oil repellency properties, it contains a hydrophilic structure and an aromatic structure in the polymer structure, so it exhibits repellency against hydrophilic properties such as moisture and sweat and lipophilic properties such as artificial sebum and edible oil. In detail, the hydrophilic structure exhibits oil repellency, and the aromatic structure exhibits water repellency and some oil repellency.

The hydrophilic structure is a structure including one or more structures selected from the group consisting of ionic or nonionic electron pair structures such as hydroxy, amine, phosphate, sulfonate, sulfate and carboxy, for example, -NH ₂ , -OH, - SO ₃ H, -PO ₄ H, -COOH, and the like, but are not limited thereto. Examples thereof include acrylic monomers such as 2-hydroxyethyl (meth)acrylate having a hydrophilic structure, acrylamide-based and acetamide-based, vinyl-based and aryl-based monomers such as vinyl acetate, vinyl pyrrolidone, and aryl ether.

In the case of an aromatic structure, it is a structure containing a form satisfying the electron pair 4n + 2 rule, for example, the aromatic structure includes at least one structure selected from the group consisting of benzyl, phenyl, naphthyl, phenanthrene, anthracene and pyrene, but However, the present invention is not limited thereto. Examples thereof include benzyl (meth)acrylate and phenyl (meth)acrylate as acrylic, acrylamide, acetamide, vinyl and aryl monomers containing an aromatic structure.

In addition, the polymer coating agent of the present invention may include a polymerized unit of a polymerizable monomer including a hydrophilic structure and an aromatic structure in one monomer at the same time.

The polymerizable 　 monomer including the above structures is 2-hydroxy-3-phenoxypropyl methacrylate (HPMA), 2-hydroxy-3-phenoxypropyl acrylate (2 -Hydroxy-3-phenoxypropyl acrylate), 2-(4-benzoyl-3-hydroxyphenoxy)ethyl acrylate [2-(4-benzoil-3-hydroxyphenoxy)ethyl acrylate], 2-(4-benzoyl-3 -Hydroxyphenoxy)ethyl methacrylate, 2-hydroxypropyl-2-(acryloyloxy)ethyl phthalate [2-hydroxy propyl-2-(acryloxy)ethyl phthalate], 2-hydroxypropyl-2- (methacryloyloxy)ethyl phthalate [2-hydroxy propyl-2-(methacryloxy)ethyl phthalate], 3-(2H-benzotriazol-2-yl)-4-hydroxyphenylethyl acrylate [3-( 2H-benzotriazol-2-yl)-4-hydroxyphenylethyl acrylate] and 3-(2H-benzotriazol-2-yl)-4-hydroxyphenylethyl methacrylate may be at least one selected from the group consisting of, but limited thereto it's not going to be

The polymer coating agent of the present invention may further include a hard portion capable of exhibiting mechanical strength when the coating agent is applied. For this, a monomer having a glass transition temperature of 30 to 120 degrees or less, preferably 40 to 100 degrees or less, of a single polymer in the polymer structure may be used. Examples thereof include at least one selected from t-butyl (meth)acrylate, cyclohexyl (meth)acrylate, isobornyl (meth)acrylate, isopropyl (meth)acrylate, methyl or ethyl (meth)acrylate, and the like. However, it is not limited thereto.

In addition, in order to exhibit the flexible properties of the coating agent, a monomer having a glass transition temperature of a single polymer in a polymer structure of −120° C. to 0° C. or less, preferably −100° C. to 30° C. or less may be further used. Examples include silicate-based (meth)acrylate having an alkylsiloxy structure, ethylhexyl (meth)acrylate having an alkylacrylic or alkylacrylamide-based structure, stearyl (meth)acrylate, lauryl (meth)acrylate There is at least one selected from the group consisting of, but is not limited thereto.

In the present invention, in the polymer structure of the coating agent, the hydrophilic structure, the aromatic structure, or a structure including the two together may contain 5 to 40% by weight of the total structure. When included in an amount of less than 5% by weight, water repellency or oil repellency or both cannot be exhibited at the same time, so it is difficult to show makeup durability, and when it is more than 40%, the stability of the polymer film material is lowered.

In the case of a monomer exhibiting the mechanical strength, it may be included in an amount of 20 to 50% by weight of a polymer, and in the case of a monomer exhibiting the flexibility, it may be included in an amount of 10 to 45% or less by a weight of a polymer.

The polymer of the coating agent of the present invention can be prepared by polymerizing the above-mentioned polymerizable monomers in an oil phase. In the case of an oil phase for synthesizing the coating agent, it is preferable to use a hydrocarbon-based non-polar or silicone-based volatile oil. In the case of hydrocarbon-based non-polar oil, the number of carbon atoms is 8 to 16, preferably, the number of carbon atoms is 10 to 16, and examples thereof include dodecane, isododecane, isoparaffin, and the like. In the case of silicone-based volatile oil, it is mainly a siloxane (-R ₂ Si-O-) structure, and in the case of R, one or more linear or cyclic structures may be formed in the form of C1 to C3 or less. For example, cyclobutasiloxane (D4), cyclopentasiloxane (D5), cyclohexasiloxane (D6), methyl trimethicone and the like may be used, but are not limited thereto.

Another aspect of the present invention is to provide a cosmetic composition for improving the durability of a cosmetic preparation comprising the polymer film agent of the present invention. The cosmetic composition according to the present invention may further include a fragrance, a colorant, a preservative, a bactericide, a pearl agent, etc. within the range that does not reduce the effect of the composition in addition to the polymer film agent of the present invention as described above.

Another aspect of the present invention is to provide a cosmetic comprising the polymer film agent of the present invention. The cosmetics include powder, face powder, compressed powder, compact, foundation, powder foundation, two-way cake, make-up base, liquid foundation, cream foundation, primer, boomer, tone-up cream, concealer, BB cream, CC cream, tinted moisturizer, Includes eye shadow, powder blush, highlighter, shading, blusher, eye makeup products (eyebrow, eyeliner, eye shadow and mascara, etc.), lip makeup products (rouge, lipstick, lip gloss, lip tint and lip balm, etc.), and sunscreen However, the present invention is not limited thereto.

The polymer film agent of the present invention and the cosmetic composition comprising the same have water-repellent and oil-repellent properties at the same time, so that makeup does not crumble and do not come off due to sweat, sebum, external moisture, or the like. As described above, the polymer film agent of the present invention and the cosmetic composition comprising the same increase the durability of makeup, so that even after a long period of time has elapsed, the number of correction makeup is reduced or does not need to be corrected.

1 shows an image of the color persistence before and after meals of Preparation Example 1 and Preparation Example 3.

Hereinafter, the present invention will be described in more detail through examples. These examples are only for illustrating the present invention in more detail, and it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples.

Example

I. water repellent / oil repellency oil dispersion Synthesis of polymer film

Comparative example One

In a reactor equipped with a cooler, nitrogen injector, thermometer, and stirrer, 200 g of isododecane, a hydrocarbon oil, 55 g of t-butyl acrylate, 5 g of isobornyl acrylate, and 40 g of tris(trimethyl siloxy)silyl propyl methacrylate were placed in a homogeneous reactor. After mixing, the temperature was slowly raised to 75 degrees. After that, 1 g of the initiator 2,2'-azobis isobutylnitrile was slowly added and reacted for more than 12 hours to synthesize an oil-dispersed polymer coating agent. The compound was subjected to primary filtration through a 200-mesh urethane mesh to remove impurities. Finally, a copolymer having a weight ratio of t-butyl acrylate/isobornyl acrylate/tris(trimethyl siloxy)silyl propyl methacrylate = 55/5/40 was obtained as a stable phase.

Example One

In the same manner as in Comparative Example 1, in a reactor equipped with a cooler, a nitrogen injector, a thermometer, and a stirrer, 200 g of isododecane, a hydrocarbon oil, 55 g of t-butyl acrylate, 40 g of tris (trimethyl siloxy) silyl propyl methacrylate, 2- 5 g of hydroxy-3-phenoxypropyl acrylate was added, and the temperature was slowly raised to 75°C with uniform mixing. Then, 1 g of initiator 2,2'-azobis isobutylnitrile was slowly added to synthesize a copolymer. After reacting for more than 12 hours, a copolymer having a weight ratio of t-butyl acrylate/tris(trimethyl siloxy)silyl propyl methacrylate/2-hydroxy-3-phenoxypropyl acrylate = 55/40/5 is finally obtained as a stable phase could be obtained with

Example 2

In the same manner as in Example 1, in a reactor equipped with a cooler, a nitrogen injector, a thermometer, and a stirrer, 200 g of isododecane, a hydrocarbon oil, 45 g of t-butyl acrylate, 30 g of tris (trimethyl siloxy) silyl propyl methacrylate, 2- 10 g of hydroxy-3-phenoxypropyl acrylate was added, and the mixture was uniformly mixed and the temperature was slowly raised to 75°C. Then, 0.85 g of initiator 2,2'-azobis isobutylnitrile was added to synthesize a copolymer, and 15 g of 2-hydroxy-3-phenoxypropyl acrylate and 2,2'-azobis iso initiator were added during the reaction for 6 hours. 0.15 g of butylnitrile was additionally added and reacted for more than 12 hours, finally t-butyl acrylate/tris(trimethyl siloxy)silyl propyl methacrylate/2-hydroxy-3-phenoxypropyl acrylate = 45/30 A copolymer with a weight ratio of /25 was obtained as a stable phase.

Example 3

Under the same synthesis conditions as in Example 2, 200 g of isododecane, 30 g of t-butyl acrylate, 30 g of tris(trimethyl siloxy)silyl propyl methacrylate, and 20 g of 2-hydroxy-3-phenoxypropyl acrylate were added. The mixture was uniformly mixed and the temperature was slowly raised to 75°C. Then, 0.8 g of initiator 2,2'-azobis isobutylnitrile was added to synthesize a copolymer, and 20 g of 2-hydroxy-3-phenoxypropyl acrylate and 2,2'-azobis iso initiator were added during the reaction for 6 hours. 0.2 g of butylnitrile was additionally added and reacted for at least 12 hours, and finally t-butyl acrylate/trimethylsiloxysillypropyl methacrylate/2-hydroxy-3-phenoxypropyl acrylate = 30/30/40 weight ratio A copolymer was obtained.

Example 4

Under the same synthesis conditions as in Example 2, 200 g of isododecane, 55 g of t-butyl acrylate, 40 g of tris(trimethyl siloxy)silyl propyl methacrylate, 2.5 g of 2-hydroxyethyl acrylate, and 2.5 g of phenyl acrylate were added. and uniformly mixed, and the temperature was slowly raised to 75°C. Then, 1 g of initiator 2,2'-azobis isobutylnitrile was slowly added to synthesize a copolymer. After reacting for more than 12 hours, a copolymer having a weight ratio of t-butyl acrylate/tris(trimethyl siloxy)silyl propyl methacrylate/2-hydroxyethyl acrylate/phenyl acrylate = 55/40/2.5/2.5 could be obtained as an award.

Example 5

Under the same synthesis conditions as in Example 2, 200 g of isododecane, 45 g of t-butyl acrylate, 30 g of tris(trimethyl siloxy)silyl propyl methacrylate, 5 g of 2-hydroxyethyl acrylate, and 5 g of phenyl acrylate were added and homogeneous. The mixture was mixed gently and the temperature was raised slowly to 75°C. After that, 0.85 g of initiator 2,2'-azobis isobutylnitrile was added to synthesize a copolymer, and 7.5 g of 2-hydroxyethyl acrylate, 7.5 g of phenyl acrylate and 2,2'-azo initiator were reacted for 6 hours. 0.15 g of bis-isobutylnitrile was additionally added and reacted for more than 12 hours, finally t-butyl acrylate/tris(trimethyl siloxy)silyl propyl methacrylate/2-hydroxyethyl acrylate/phenyl acrylate = 45/ A copolymer having a weight ratio of 30/12.5/12.5 was obtained.

Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Example 5 Monomer t-Butyl acrylate 55 55 45 30 55 45 Isobornyl Acrylate 5 - - - - - Tris(trimethyl siloxy)silyl propyl methacrylate 40 40 30 30 40 30 2-hydroxy-3-phenoxypropyl acrylate - 5 25 40 - - 2-hydroxyethyl acrylate - 2.5 12.5 phenyl acrylate - 2.5 12.5 Initiator 2,2'-Azobis Isobutylnitrile One One One One One One menstruum isododecane 200 200 200 200 200 200 stability stability stability stability Sedimentation stability Sedimentation

II. film agent water repellent / oil repellency Characteristics and stickiness analysis

Six types of water/oil repellent oil-repellent oil-dispersion polymer coating agents having the compositions shown in Table 1 were prepared in the form of coatings and their physical properties were evaluated.

1. Manufacturing method

1) On the slide glass, 4 types of coating agents were aliquoted in 2 mL each and dropped.

2) Coated with a thickness of 50 μm using a Doctor blade coater.

3) It was dried in a convection oven at 70°C for more than 12 hours.

4) The dried sample was taken out at room temperature for more than 6 hours.

2. Evaluation method

1) The contact angle between water and artificial sebum was measured using a contact angle meter.

2) For water, distilled water, and for artificial sebum, a mixture of CAPRYLIC/CAPRIC TRIGLYCERIDE, JOJOBA OIL, and ISOSTEARIC ACID was used.

3) For stickiness, ball tackiness was measured using a texture analyzer.

4) The stickiness was measured by measuring the tension required to remove after contacting for 5 seconds with a contact force of 100 g.

The results of the initial contact angle / stickiness for water or artificial sebum and edible oil measured as described above are shown in Table 2 below.

Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Example 5 water contact angle 72° 89° 95° 96° 85° 93° artificial sebum contact angle 22° 35° 49° 51° 28° 34° edible oil contact angle 27° 38° 52° 50° 30° 39° stickiness 22.4 gf 10.6 gf 5.2 gf 6.8 gf 15.7 gf 18.8 gf

As a result of the experiment, Examples 1 to 3, in which a monomer containing a hydrophilic portion and a hydrophobic portion were added at the same time, showed little stickiness, but when the hydrophobic portion and the hydrophilic portion were present in different monomers, it was confirmed that it was disadvantageous in terms of stickiness.

III. oil dispersibility lip rouge Produce

An oil-dispersible lip rouge formulation was prepared using the Preparation Examples and Comparative Examples of the composition shown in Table 3, and the quality thereof was evaluated.

1. Manufacturing method

1) Components 1-3 were dispersed by heating at 50 degrees.

2) After adding component 7 to 1) and uniformly dispersing, components 4 to 6 were dispersed by heating at 50 degrees.

3) After cooling to room temperature, an oil-dispersible lip rouge was prepared.

(weight %) Manufacturing Example 1 Manufacturing Example 2 Manufacturing Example 3 Manufacturing Example 4 One Comparative Example 1 60 - - - Example 1 - 60 - - Example 2 - - 60 - Example 3 - - - 60 2 isododecane 25 25 25 25 3 1,2-Hexanediol 0.5 0.5 0.5 0.5 4 Dimethicone 0.5 0.5 0.5 0.5 5 Inorganic powder (hectorite type) 3 3 3 3 6 propylene carbonate One One One One 7 RED base pigment 10 10 10 10 User evaluation of oil dispersible lip rouge 1) Spreadability ○ ○ ○ △ 2) Makeup effect ○ ○ ○ ○ 3) Buried X ○ ◎ △ 4) smear X ○ ◎ ○ 5) Color Persistence X △ ◎ △

2. lip rouge oil dispersibility Formulation evaluation method

User evaluation of the prepared oil-dispersible lip rouge formulation was conducted by 15 expert evaluation panelists (ages 20 to 35).

Describe the color persistence by judging the spreadability of the oil-dispersible lip rouge formulation (smooth application when applied on the lips), the cosmetic effect, and the degree of smearing, smearing and remaining makeup on the lips after 6 hours of application. Five-level evaluation was made based on the standard of , and the average was judged.

The results of Table 3 are described as follows: ◎ average point 4 or more, ○ average point 3 or more but less than 4, △ average point 2 or more and less than 3, and X average point less than 2.

In the case of Preparation Examples 2 to 4 including the water/oil-repellent polymer film agent, compared to Preparation Example 1 which did not include it, it was confirmed that overall makeup durability was excellent. In addition, Preparation Example 3, which included a water/oil repellent polymer coating agent obtained in a uniform and stable phase, was particularly excellent in makeup durability.

IV. W/O liquid Foundation Manufacturing

Using the Preparation Examples and Comparative Examples of the composition shown in Table 4, W / O liquid foundation formulations were prepared and the quality thereof was evaluated.

1. Manufacturing method

1) After uniformly dispersing components 1 and 4, heating to 50 degrees, components 6, 2, and 3 were sequentially added.

2) After adding component 8 to 1) and uniformly dispersing, components 5 and 7 were dispersed by heating at 50 degrees.

3) After cooling to room temperature, a W/O liquid foundation was prepared.

(weight %) Manufacturing Example 1 Manufacturing Example 2 Manufacturing Example 3 Manufacturing Example 4 One Comparative Example 1 15 - - - Example 1 - 15 - - Example 2 - - 15 - Example 3 - - - 15 2 Alcohol 5 5 5 5 3 Distilled water 30 30 30 30 4 Volatile oils (ex.cyclopentasiloxane) 20 20 20 20 5 Inorganic powder (hectorite type) 5 5 5 5 6 W/O emulsifier 2 2 2 2 7 emollient 3 3 3 3 8 pigment 20 20 20 20 W/O Foundation user evaluation 1) Makeup effect △ ○ ○ △ 2) Buried X ○ ◎ △

2. W/O liquid Foundation evaluation method

User evaluation of the prepared W/O liquid foundation formulation was performed by 15 professional evaluation panels (ages 20 to 35).

The makeup effect (applicability, stickiness, etc.) of the prepared foundation and the degree of smearing on clothes, mobile phones, etc. after 6 hours of application were judged.

The results of Table 4 are described as follows: ◎ average point 4 or more, ○ average point 3 or more but less than 4, △ average point 2 or more and less than 3, and X average point less than 2.

In the case of Preparation Examples 2 to 4 including the water/oil-repellent polymer film agent, compared to Preparation Example 1 which did not include it, it was confirmed that overall makeup durability was excellent. In addition, Preparation Example 3, which included a water/oil repellent polymer coating agent obtained in a uniform and stable phase, was particularly excellent in makeup durability.

V. O/W sun cream manufacturing

O/W sunscreens were manufactured using the preparation examples and comparative examples of the composition shown in Table 5, and the quality thereof was evaluated.

1. Manufacturing method

1) After uniformly dispersing components 1 and 4, heating to 50 degrees, components 6, 2, and 3 were sequentially added.

2) After adding component 8 to 1) and uniformly dispersing, components 5 and 7 were dispersed by heating at 50 degrees.

3) After cooling to room temperature, W/O sunscreen was prepared.

(weight %) Manufacturing Example 1 Manufacturing Example 2 Manufacturing Example 3 Manufacturing Example 4 One Comparative Example 1 2 - - - Example 1 - 2 - - Example 2 - - 2 - Example 3 - - - 2 2 Alcohol 18 18 18 18 3 Distilled water 51 51 51 51 4 Volatile oils (ex.cyclopentasiloxane) 20 20 20 20 5 UV blocker 5 5 5 5 6 O/W emulsifier 2 2 2 2 7 plastic powder 2 2 2 2 O/W sunscreen user evaluation 1) Degree of maintaining UV blocking effect X X ○ △

2. O/W sunscreen evaluation method

After applying the prepared O/W sunscreen formulation to a slide glass, the UV blocking effect was evaluated by comparing the initial UV blocking effect and the UV blocking effect after washing with tap water once.

The results of Table 5 are explained as follows: ○ Maintain UV protection of 40% or more, △ Maintain UV protection of 20% or more, less than 40%, and maintain UV protection of less than 20%.

In the case of Preparation Examples 2 to 4 including the water/oil-repellent polymer film agent, compared to Preparation Example 1 which did not include it, it was confirmed that overall UV blocking effect was maintained. In addition, Preparation Example 3, which included a water/oil repellent polymer coating agent obtained in a uniform and stable phase, was particularly excellent in maintaining the UV blocking effect.

Claims (5)

A method for producing a polymer coating agent comprising polymerizing a monomer for polymer production in an oil phase system, the method comprising:
The method for preparing the polymer comprises a polymerizable monomer including a hydrophilic structure and an aromatic structure in one monomer at the same time. The method of claim 1, wherein the monomer for preparing the polymer further comprises (ii) a polymerizable monomer exhibiting mechanical strength and (iii) a polymerizable monomer exhibiting flexibility. The method according to claim 1, wherein the oil phase comprises at least one selected from the group consisting of a hydrocarbon-based non-polar oil and a silicone-based volatile oil. 4. The method of claim 3, wherein the hydrocarbon-based apolar oil contains from 8 to 16 carbon atoms. The method according to claim 3, wherein the silicone-based volatile oil has _{a siloxane structure of -R 2} Si-O-, wherein R has a linear or cyclic structure containing 1 to 3 carbon atoms. how it is.

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